<template>
	<div
		v-if="isExternal"
		:style="styleExternalIcon"
		class="svg-external-icon svg-icon"
		v-on="$listeners"
	/>
	<svg
		v-else
		:class="svgClass"
		aria-hidden="true"
		v-on="$listeners"
	>
		<use :xlink:href="iconName" />
	</svg>
</template>

<script>
	// doc: https://panjiachen.github.io/vue-element-admin-site/feature/component/svg-icon.html#usage
  import { isExternal } from '@/utils/validate'

  export default {
    name: 'SvgIcon',
    props: {
      iconClass: {
        type: String,
        required: true
      },
      className: {
        type: String,
        default: ''
      }
    },
    computed: {
      isExternal() {
        return isExternal(this.iconClass)
      },
      iconName() {
        return `#icon-${this.iconClass}`
      },
      svgClass() {
        if (this.className) {
          return 'svg-icon ' + this.className
        }
        return 'svg-icon'
      },
      styleExternalIcon() {
        return {
          mask: `url(${this.iconClass}) no-repeat 50% 50%`,
          '-webkit-mask': `url(${this.iconClass}) no-repeat 50% 50%`
        }
      }
    }
  }
</script>

<style scoped>
	.svg-icon {
		width: 1em;
		height: 1em;
		vertical-align: -0.15em;
		fill: currentColor;
		overflow: hidden;
	}

	.svg-external-icon {
		background-color: currentColor;
		mask-size: cover !important;
		display: inline-block;
	}
</style>
